Explosive load for mines



Marchs, 1943. @WEBER 2,313,210

EXPLOSIVE LOADS FOR MINES Filed Feb. 1v, 19:59

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ATTORNEYS.

Patented Mar. 9, 1943 EXPLOSIVE LOAD FOR MINES Guillaume Weber, MondorflesBains, Luxembourg; vested in the-Alien Property Custodian Application February 17, 1939, Serial No. 257,008 In Luxembourg February 18, 1938 claims. (ci. 1oz-24) The present invention relates to an improved construction of an explosive load for mines and the like.

Explosive loads for mines are known which consist in a priming-cartridge, an explosive substance and a water cartridge, the instantaneous evaporation of the water being effected by the great heat developed by the priming-cartridge when it explodes. In certain cases, metallic powders, iron filings or-clippings are added to the water or to the substances impregnated with water. This arrangement negatives the eiiect of these substances, since they are immersed in the water and cannot work as efficiently as they would if they were separated from the water and directly connected with a source of heat.

The loading tube or case is preferably made of paper, linen or similar fibrous substances in order to facilitate the introduction, into the blasthole, oi' a load of several cartridges and thus avoid losses of the explosive substance in the clefts of the ground.

The present invention has for its object certain improvements in and relating to the explosive loads for mines and consists in introducing the explosive cartridges of any sort, comprising those with liquid oxygen, into a special tube or case containing metallic and combustible powders. The metallic powders are either coated on the'intericr surface of the tube, or they are lodged between one or more spirals of the tube or mixed with other substances between two or several spirals oi the tube.

They can also be incorporated in the paper ply when the tube is being manufactured.

Figure l is a perspective view of a portion of a tube, the interior surface of 'which is coated with metallic powders.

Figure 2 is a cross sectional view of a modified arrangement showing metallic powders lodged between one or more spires of a paper tube.

Figure.3 is a cross sectional view of a further modiiication in which spongy inactive incombustible substances are impregnated with water or cooling salts.

Figure 4 is a sectional view through a tube blank with metallic powders incorporated therein.

The loading tubes are also lt for the explosive.

loads with cartridges containing water or substances impregnated with water. The water can Y also be present in combination with other substances, such as infusorial earth, ground slag,

The combustible powders used can be alumi- The combustible powders used can be aluminium, magnesium, silicium, calcium, iron, f silicoture of these powders. The combustible powders will advantageously -be mixed with metallic oxides, for instance with oxides of iron or with other substances which hasten the oxidation process.

stances or in the form of a colloidal dispersion. Through the great heat produced by the priming cartridge and the metallic powders of the loading tube at the moment of the defiagration, the water is instantaneously gasied and the gaseous volume and thus the power of the explosive load is increased.

The dislocation of the ground being the same, the explosive load can be reduced by using water cartridges; the quantity of smoke is also reduced in a proportion at least equal to the reduction of the explosive load. Through the use of the special loading tube, the workmen, when working underground, are not any more inconvenienced by the smoke, as is generally the case when using dynamites, cheddites, compressed powders, etc., without any special loading tube.

It is possible to return almost immediately to the loading tubes accordin the working place if tothe present specliication are utilized.

When used in coal-pits rendered more or vless dangerous by fire-damp or dust, the metallic powders of the tube are by other powders, like certain carbonates or other substances fit to extinguish lire. f

The water cartridges used in the coal-pits will contain inactive, incombustible absorptive submagnesia carbonate, etc., preferably mixed with cooling salts. The explosive loads thus constituted and combined with the ordinary safety explosive substance warrant a maximum of security in the coal-pits rendered dangerous .by fire-damp or dust.

The explosive loads contained in special tubes or cases, according to the present invention, are also iit to be used for the felling of material in large quantities in mine-rooms or through use in ver-tical holes of a large diameter, and with water cartridges in the mediate stuiiing is used.

According to the foregoing and in reducing the invention to'practice as shown in Fig. 1, the me- By using the loading tubes according to the tallic powders are coated on to the ings-ide of a cylindrical tube which is preferably made of paper, while according to Fig. 2 the paper tube is spiraled and the metallic powders are lodged partially or` totally replaced l quarries where an interbetween one or more of the spirals. In the form shown in Fig. 3, spongy inactivevincombustible substances impregnated with water or cooling salts are lodged between two or more spirals of the tube. In Fig. 4 there is shown a tube blank in which the metallic powders are incorporated therein. From this blank the tube can be rolled into shape and present much the same appearance as that tube'shown in Fig. l..

I claim: i

1.- An explosive cartridge comprising an inner core of explosive material and an outer fibrous wrapper surrounding said core and being lim-A pregnated with at least one finely-divided, combustible metallic powder.

2. An explosive cartridge comprising an inner material ,and an outer nbrous layers around said core, said core of 'explosive sheet wrapped in fibrous sheet being impregnated between said layers with a finely-divided, combustible metallic powder.

3. An explosive cartridge comprising an inner core of explosive material and an outer brous wrapper surrounding said core, said wrapper being impregnated by a mixture of a finely-divided,

- combustible metallic powder and a metallic oxide 'tute a coating on the including a cartridge consisting' of a 

